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Note 10 - Acquisition of Nora (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
    As of August 7th, 2018  
    (In thousands)  
         
Assets acquired (excluding goodwill)   $ 359,335  
Liabilities assumed     (114,049 )
Net assets acquired     245,286  
Purchase price     447,192  
Goodwill, excess of purchase price   $ 201,906  
Business Acquisition, Pro Forma Information [Table Text Block]
    Pro Forma Consolidated Statement of Operations     
                 
    Three months ended     Six months ended  
    July 1, 2018     July 1, 2018  
    (In thousands)  
Revenue   $ 354,295     $ 651,393  
Net income     28,471       42,743